2013 Prius two with 400k miles. Engine was replaced unknown millage. Any ideas where to start on trying to solve this? It’s certainly burning oil, about a quart every 2k miles. Coolant level hasn’t changed so I don’t think the gasket went(previous owner replaced with a aftermarket one). I’ve heard the pcv should be replaced and the egr should be cleaned. It does have a very intermittent misfire. Happened maybe once or twice over 2k miles. I checked when it misfired and there was a pending code for cylinder 3 but it has gone away on its own.

I’m just looking for advice/suggestions to keep this one going as long as I can. Once it dies I’ll get a gen4 engine. Thanks!